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Synthesis and behaviour of PEG-b-PDEAm block copolymers in aqueous solution

Abstract : Well-defined double hydrophilic block copolymers (DHBCs) of poly(ethylene glycol)-block-poly(N,N-diethyla-crylamide) (PEG-b-PDEAm) were synthesized via a reversible addition-fragmentation chain-transfer (RAFT) polymerization of N,N-diethylacrylamide (DEAm) using dithioester terminated PEG of different chain lengths as macro-chain transfer agents. Controlled molecular weight and narrow molecular weight distribution were achieved as proven by size exclusion chromatography (SEC). Cloud points (CP) were determined via turbidity measurements with ultraviolet-visible spectroscopy (UV-vis) and LCST by differential scanning micro-calori-metry (micro-DSC). They range from 32 to 40°C depending on the PDEAm length block and its concentration. Above the LCST, fluorescence spectroscopy and dynamic light scattering (DLS) demonstrated that the PEG-b-PDEAm copolymers self-organized into large aggregates. More interestingly, copolymers pre-aggregated at relatively high concentrations below the LCST.
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Submitted on : Friday, March 20, 2020 - 2:55:58 PM
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Xuewei Zhang, Tobias Burton, Martin In, Sylvie Begu, Anne Aubert-Pouëssel, et al.. Synthesis and behaviour of PEG-b-PDEAm block copolymers in aqueous solution. Materials Today Communications, Elsevier, 2020, 24, pp.100987. ⟨10.1016/j.mtcomm.2020.100987⟩. ⟨hal-02507349⟩

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